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Bug #1532

Increased number of poll timeouts on shared PDCHs

Added by zecke almost 4 years ago. Updated almost 2 years ago.

Status:
New
Priority:
Low
Assignee:
sysmocom
Target version:
-
Start date:
02/22/2016
Due date:
% Done:

0%

Spec Reference:

Description

**There seems to be an increased number of poll timeouts if TBFs share a single PDCH in comparison to completely separated TBFs (no common PDCH). Interestingly there haven't been any SBA timeouts (at least I did not see any in the statistics I have looked at so far).

The MS recover without problems, at least when using 2 MS only. This might be different with a large number of MS and an increased probability for collisions.

It might be a frame usage/allocation issue, e.g. 2 MS sending frames simultaneously.

More testing and analysis is needed.

Osmo-PCU> show bts statistics
BTS Statistics:
TBF DL Allocated : 13 (0/s 0/m 0/h 0/d)
TBF DL Freed : 12 (0/s 0/m 0/h 0/d)
TBF UL Allocated : 363 (0/s 0/m 0/h 0/d)
TBF UL Freed : 363 (0/s 0/m 0/h 0/d)
TBF Reused : 1 (0/s 0/m 0/h 0/d)
RLC Sent : 36706 (0/s 0/m 0/h 0/d)
RLC Resent : 10385 (0/s 0/m 0/h 0/d)
RLC Restarted : 4304 (0/s 0/m 0/h 0/d)
RLC Stalled : 93 (0/s 0/m 0/h 0/d)
RLC Nacked : 40 (0/s 0/m 0/h 0/d)
RLC Assign Timeout : 8 (0/s 0/m 0/h 0/d) <<<
RLC Ack Timeout : 63 (0/s 0/m 0/h 0/d) <<<
RLC Release Timeout : 0 (0/s 0/m 0/h 0/d)
Decode Errors : 0 (0/s 0/m 0/h 0/d)
SBA Allocated : 8 (0/s 0/m 0/h 0/d)
SBA Freed : 8 (0/s 0/m 0/h 0/d)
SBA Timeout : 0 (0/s 0/m 0/h 0/d) <<<
Timedout Frames : 3 (0/s 0/m 0/h 0/d)
Dropped Frames : 3 (0/s 0/m 0/h 0/d)
Scheduled Frames : 2782 (0/s 0/m 0/h 0/d)
RACH requests : 8 (0/s 0/m 0/h 0/d)

Related issues

Related to OsmoPCU - Bug #1524: PACCH on the wrong timeslotStalled02/22/2016

History

#1 Updated by zecke almost 4 years ago

From Jacob:

This has improved, but there are still poll timeouts which are not fully understood.
Possible explanations

  • PACCH mismatch
  • ???

The number of poll timeouts seem to increase if much logging output is enabled.

#2 Updated by msuraev almost 2 years ago

  • Related to Bug #1524: PACCH on the wrong timeslot added

#3 Updated by laforge almost 2 years ago

  • Assignee deleted (msuraev)

#4 Updated by laforge almost 2 years ago

  • Assignee set to sysmocom

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